Lifting jack



Jame 16, I931. I E. L. LEENBACH LIFTING JACK Filed Sept. 12, 1927 2 Sheets-sheaf. l

Zia/anion Junelfi, 1931. E. L. LEfNBAcH 1,809,979

'LIFTING' JACK Filed Sept. 12, 192? 2 Sheets-Sheet 2 Patented June 16, 1931 UNITED STATES PATENT *orrica EDWARD I. IJEINBACH, OF CHICAGO, ILLINOIS LIFTIN'G JACK.

.Application filed September 12, 1927. Serial No. 218,881.

This invention relates'to improvements in lift'ing jacks and one ofthe objects of the invention is to provide an improved jaok ofthis character by means of the use of which the lifting of a load may be started from a low point adjacent the base offthe standard, whereby the'lifting member may be inserted beneath an object in closefproximity to the ,ground, and carried to a high point adjacent the extreme top of the jack. 7 i V A further object is to provide an improved portable jack of this character in which the .body of the jack is composed of telescop-' ing uprights or standards, and alifting member movable lengthwise ofthe standards and for substantially the entire length of the telescopingioperationsor movements of the sections or standardsone with relation to the other, the lifting ememb'er traveling at a greater rate of speed than the speed of telescoping movement of'the standards. To the attainment of these ends and the accomplishment of other, new and useful objects as will appear, the invention consists in the features of novelty in substantially the construction, combination and arrangement of the several parts, hereinafter more fully described .and claimed'and shown in them:- companying drawings illustrating this invention and in which A Figure 1 1s a perspective view of a lifting jack of this character constructed in accordance with the principles of'th is' inveng ings thenumeral .10 designates a supportiing base which .may be of any desired "size.

and configuration, one end of which is shaped projects intothe slot 14:inthe standard 13 to form a chamber 11, and the other endis preferably reduced to form an extending foot portion 12. Supported by the base 10 is a stationary N upright or, standard13whi'ch ishollow and'-55 is provided witha slot 1a opening through one side thereof and extending lengthwise of the standard.

Connected with this standard islaflange 15 Which may form a closure for the chain-6 ber 11 and the'flanlge is held inTpo'sit-ion by means of suitable fastening devices' lti such as screws or-bolts. v I

I Telescoping with the standard 13i s an other hollow standard 17 whichsis also pro vided With 21. slot 18 opening through one side thereof and extending lengthwise of'the standard. The top of the standard 17 is bifurcated-as at 19 and a roller 20 isjournaled.

upon an axle 21in the bifurcation;-

The axle- 21 is preferablyremovable and is held in position against'accidentaldisplacement by means of a cap member 22 which forms a lifting head and is removably con-,.

nected with the upper end of the standard-17, V

The capv member isprovided with a flange portion 23 which extends over the ends of the axle 21 v to prevent accidental displacement thereof.

SW18 in the Standard 7 prfeiablr terminates short of the bottom 'ofthe stand ard and apinor projectionf24 is secured to the standard 17 adjacent its lower end and so asto prevent the standards from being rotated one with respect to the other but permits of ".a longitudinal adjustment of the standard "17 with 'respectto the standard 13.

Athreaded'bearing 25 is arranged in-the 1 lowerendof the 'standard17 and an elongated sc'rew'26i passes through the bearing 25 and into the standard 17. Thisscrew 26 is preferably ofa length substantially equal to the length of the standard 13 so that by ro tating the screw the standard 17 may beadjusted lengthwise of the standard 13.

Connected with the screw 26 and arranged within the chamber 11 is a gear 27 preferably of the beveled type and the screw is supported preferably by means of a roller bearing 28 arranged Within the chamber 11.

A gear 29, the shaft 30 of which is journaled in a suitable bearing, meshes with the gear 27 and by rotating the gear 29 the screw 26 will be rotated and the standards relative ly adjusted.

The bearing 31 of the gear 29 is preferably hollow and is angular in cross section as at 32 for the reception of a tool or implement by means of which the gear 29 may be rotated.

A lifting member 33 is provided with a comparatively broad lifting surface and a body portion 34, the latter being of a size to extend through the slots 14 and 18 in the standards 13-17 which register with each other and carried by the inner end of the body portion 34 of the lifting member is a sleeve or bearing 35 of a diameter considerably greater than the width of the slots 1814, and through which bearing-or sleeve 35 the screw 26 loosely passes. The sleeve 35 is preferably extended in length and substantially fits within the standard 17 and acts as a bearing for guiding the lifting member 33 and also for preventing the lifting member from tiltin with respect to the standards.

A flexible member 36, which may be in the form of a chain, cable or the like, is provided and is anchored by one end preferably to the upper end of the standard 13 by means of a head 37 secured to the end of the flexible member 36, and which head 37 passes beneath ears 38 on the standard 13, and which ears form a bifurcated portion 39 in which the adjacent portion of the flexible member 36 stands.

To the other end of the flexible member 36 is secured a head 40 and this head engages under shoulders 41 formed by a portion of the lifting member .33, the flexible member passing into a bifurcation 42 in the adjacent end of the lifting member.

The flexible member 36 is preferably of a length that when the lifting member 33 is at the limit of its downward movement andthe standards 1317 are telescoped to their fullest extent, it will be substantially taut.

The flange 23 on the head member 22 also serves as a means for holding the flexible member against displacement with respect to the roller 20.

Assuming the parts to be in the position shown in Figure 3, the lifting member 33 will be at its lowermost point and the standards will be telescoped with respect to each other.

The foot 12- on the base 10 is disposed be neath the lifting member 33. In this position it will be manifest that the lifting member 33 may be inserted under an object or load in close proximity to the ground and the foot portion 12 of the base will prevent the jack from being tilted forwardly by the weight of the load when the latter is lifted.

By rotating the gear 29 the screw 26 will be rotated and this will, through the medium of the nut or threaded bearing 25 cause the standards 17 to be projected with respect to the standard 13, with the result that the roller 20 will be forced against the flexible member 36 intermediate its anchored ends, with the result that as the standard 17 is raised the lifting member 33 will also be raised and by reason of the construction herein shown the lifting member 33 will travel at a greater rate of speed than the speed of the relative longitudinal movement of the standard 17 with respect to the standard 13, so that by the time the standard 17 has been moved to the limit of its adjustment or extension movement with respect to the standard 13 the lifting surface of the member 33 will reach the limit of its upward movement.

During the first portion of the movement of the standard 17 with respect to the standard 13. the lifting member 33 will travel longitudinallv with respect to both of the standards and as the lifting member reaches the top of the standard 13 it will then continue to travel towards the upper end of the jack and will successively pass out of engagement with the standard 13 and into engagement with the standard 17.

The lifting member 33 is assembled with respect to the-standards, through the base of the standard 17 before the standard 17 is telescoped with the standard 13.

Thehead 22 of the standard 17 may also be used as a lifting head.

The periphery of the extremity of the bearing 30 be undulated as at 43, if desired, so as to permit the gear 29 to be rotated by the hands of the operator.

While the preferred form of the invention has been herein shown and described, it is to be understood that various changes may be made in the details of construction and in the combination and arrangement of the several parts, within the scope of the claims, without departing from the spirit of this invention.

What is claimed as new is 1. A lifting jack embodying telescoping standards, a lifting member having an active face adapted to assume a position adjacent the lower end of both of the standards, said a and means on said lifting member co-operating with the screw for guiding and maintaining said lifting member in position during the entire movement of the standards out of telescoping relation, the said screw and lifting member being movable independently with respect to each other.

2. A lifting jack embodying a pair of telescoped standards, means for effecting a relative longitudinal sliding movement thereof, a lifting member successively movable lengthwise of said standards, said lifting member having a lifting surface adapted to assume a position adjacent the base of the stationary standard, a flexible element connected with the stationary one of the standards and also to the said lifting member, and a roller carried by the movable one of the standards and engaging the flexible member intermediate its anchored ends for moving the lifting member during the relative movement of said standards.

3. A lifting jack embodying a stationary standard, a movable standard telescoped thereinto, a screw for effecting a relative longitudinalmovement of the standards, said screw being fixed against bodily endwise movement, a lifting member successively movable lengthwise of both of the standards a flexible element, a shoulder on one of the standards, said shoulder having an open slot therein, one end of the said element being disposed in. said slot, a shoulder on the element engaging under the first said shoulder, a shoulder on the lifting member and having an open slot therein, the other end of said element entering the last said slot, a shoulder on the element engaging under the shoulder on the lifting member, and an anti-friction device connected with the movable one of the standards and engaging the said flexible member intermediate-its anchored ends for effecting a movement of the lifting member. with relation to the standards during the telescoping movement ofthe latter.

4. A lifting jack embodying a pair of hollow telescoped standards, each of said standards having registering slot openings through their sides and extending lengthwise of the standards and to points in close proximity to the respective bases thereof, a screw in one of the standards for effecting a relative longitudinal movement of the standards, a, lifting member extending into said slots, and means responslve to the telescop c movements of said standards for causing the said lifting gagement with the other of the standards intermediate the anchored portions of the flexible member. i

' 6. A lifting jack embodying a hollow standard, a rotatable upright screw fixed within the standard, an actuating member operably connected with the screw adjacent the bottom of the screw and standard, a seoond standard slidably telescoped within the first said standard and operatively connected with the screw, a lifting element slidably engaging both of the standards and adapted to assume a position adjacent the base of the first said standard, and a flexible element connected with the stationary standard and also to said lifting element, the second said standard contacting with said flexible element intermediate its points of connection with the lifting element and the stationary standard.

7. A lifting jack embodying a hollow standard, a rotatable upright screw fixed.

within the standard, an actuating member 7 operably connected with the screw adjacent the bottom of the screw and standard, a second standard slidably telescoped within the first said standard and operatively connected with a screw, a lifting element slidably engaging both of the standards and adapted to assume a position adjacent the base of the first said standard, and a flexible element connected with the stationary standard and also to said lifting element, the second said standard contacting with said flexible element intermediateits points of connection with the lifting element and the stationary standard, whereby when said screw is continuously actuated said lifting element will travel suc-' In testimony whereof I have signed my name to this specification on this 6th day of September, A. D. 1927.

EDWARD L. LEINBACH.

member and to one of said standards, said i flexible member passing over and having en- 

